Active particles confined in deformable droplets

TL;DR

This paper investigates how active particles within deformable droplets influence droplet shape and particle distribution, revealing enhanced shape fluctuations and complex phase behaviors driven by activity levels.

Contribution

It introduces a model linking active particle activity to droplet deformation and phase behavior, aligning with recent experimental findings.

Findings

Active particles induce enhanced shape fluctuations.

Two mechanisms of droplet breakage identified.

Alignment with recent experimental observations.

Abstract

Active particles under soft confinement such as droplets or vesicles present intriguing phenomena, as collective motion emerges alongside the deformation of the environment. A model is employed to systematically investigate droplet morphology and particle distribution in relation to activity and concentration,revealing that active particles have the capacity to induce enhanced shape fluctuations in the droplet interface with respect to the thermal fluctuations, aligning with recent experimental observations. A rich phase behaviour can be identified with two different mechanism of droplet breakage.